Natural coir mats use fibres taken from coconut shells. Coconut fibre provides strong brushing action. The structure suits doorway placement. Foot traffic activates the cleaning action. This reduces the amount of debris entering a building. The Origin of Coir Mat Materials Coir fibre comes from the outer shell of coconuts. https://antislipmats67542.tinyblogging.com/what-defines-a-coir-door-mat-83348493